MC7455 location support

[Karoly Pados]

Hello,

Thanks for your reply. Are you sure the modem is not already in QMI mode? MM is clearly using QMI to communicate with it (and I can also use qmicli -p), and also below URL states that this modem is a QMI raw-ip only modem.

https://sigquit.wordpress.com/2017/01/07/modemmanager-in-openwrt-take-2

Though I also admit I am not 100% sure, because the protocol relations and communication possibilities with the modem are not yet clear to me (I am quite new to this topic).

Though I am a developer myself, I don't have much experience with different modems yet. So while I can gladly try to implement support for my modem's GNSS AT command set, it might end up being very model-specific. With some pointers though about which source files and APIs to start with (I don't have a clue yet about MM's code either), I might give it a go if you don't mind.

Regards,

Károly

April 12, 2017 5:58 PM, "Dan Williams" <dcbw at redhat.com> wrote:

> On Wed, 2017-04-12 at 13:21 +0000, Karoly Pados wrote:
> 
>> Hello,
>> 
>> I have a MC7455 form Sierra Wireless. It is working fine for data
>> communication, but ModemManager doesn't seem to be able to recognize
>> the locations services (GPS and A-GPS) provided by the modem. 
>> 
>> mmcli -m 0 --location-status
>> 
>> /org/freedesktop/ModemManager1/Modem/0
>> ----------------------------
>> Location |   capabilities: '3gpp-lac-ci'
>> |        enabled: '3gpp-lac-ci'
>> |        signals: 'no'
>> 
>> If I start ModemManager with the --debug flag and then issue AT-
>> commands using --command by hand, I can get a GPS fix and retrieve
>> the location using raw AT commands. (This also means that in my case
>> there is no need to unlock location services using a password.)
>> 
>> I read on this list that the modem needs to be in QMI-mode for MM to
>> support location data. I think this is already the case because when
>> I start MM in debug mode I can see it is using QMI to communicate.
>> 
>> Is there anything else I can do or need to check to make location
>> data in MM working? Or any way I can help to implement support for
>> it?
> 
> At the moment, no. The device is likely in MBIM mode which is why you
> don't get location data. There are two options we are exploring for
> ModemManager:
> 
> 1) use the MBIM QMI passthrough to provide the location data that QMI
> can provide, which will work with this device because it's a Qualcomm-
> based one
> 
> 2) if that fails, see if we can use the AT ports for GPS
> 
> This is mainly just a problem for MBIM devices, because the MBIM
> protocol specification does not contain any GPS-related options. That
> is left to vendor proprietary methods, as you've discovered :)
> 
> So TLDR; you can't do this yet but it's at least being thought
> about/worked on. If you're interested in helping fix this, we can use
> either code or testing...
> 
> Thanks!
> Dan
> 
>> My software:
>> # uname -a
>> Linux a13-olinuxino 4.9.21 #2 SMP Mon Apr 10 10:29:48 CEST 2017
>> armv7l GNU/Linux
>> # ModemManager --version
>> ModemManager 1.6.2
>> ...
>> # qmicli --version
>> qmicli 1.16.0
>> ...
>> 
>> Thank you for your help, greetings,
>> 
>> Károly Pados
>> 
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